Low-temperature (293-60 K) Raman spectra of the crystalline tert-butylisocyanide complexes, Cr(CO)5(CNBu-t) and cis-Cr(CO)4(CNBu-t)2

Abstract

Low-temperature (293–60 K) Raman spectra have been recorded in the 3500–50 cm–1 region for the crystalline tert-butylisocyanide (CNBu-t) complexes, Cr(CO)5(CNBu-t) (I) and cis-Cr(CO)4(CNBu-t)2 (II). Several of the factor group splittings that are predicted for the νCO, νCN, νCrC, νCrCN and δCrCO modes on the basis of the P21/a (C2h5) (I) and Pccn (D2h10) (II) crystallographic symmetries can be detected at very low temperatures. No phase transitions are observed for either complex throughout the temperature range investigated.